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An independent contractor is the correct answer.
Independent contractors are businesses, corporations or people who provide some kind of goods or services to another person or organization under a contract between them. In order for a person to be considered self-employed, or an independent contractor, he/she must be free from the client's control, be able to control the manner and methods to accomplish the end-result, and be responsible for the delivery of the good and service under the terms of the contract.
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